1. Department of Epidemiology, University of California at Los Angeles School of Public Health, Los Angeles, California, USA
2. Department of Neurology, School of Medicine, University of California at Los Angeles, Los Angeles, California, USA
3. Department of Health Care Management, College of Healthcare Administration and Management, National Taipei University of Nursing and Health Sciences, Taipei, Taiwan
4. Danish Cancer Society Research Center, Danish Cancer Society, Copenhagen, Denmark
5. Department of Environmental Science, Aarhus University, Roskilde, Denmark